#include <stdio.h>

int main(int argc, char const *argv[])
{
    int a[5];
    int *pa = &a[0];
    int *pb = &a[4];
    printf("pa=%p\n",pa);
    printf("pb=%p\n",pb);

    printf("pb-pa=%d\n",pb-pa);//pb-pa = (pb-pa)/sizeof(int)

    return 0;
}
